Summary

In the days of the caliph al-Muqtadi, Nizam al-Mulk gathered the astrologers, who fixed Nawruz at the first point of Aries. ²

The change

Before this, Nawruz fell when the sun entered the middle of Pisces. The source says that what Nizam al-Mulk did became the basis of the calendars. ²

The source does not specify the year; it is approximately 471 AH, during the caliphate of al-Muqtadi. This needs an additional source.

The Nizamiyya Madrasa of Baghdad

The Nizamiyya of Baghdad, first and most famous of the madrasas founded by the vizier Nizam al-Mulk al-Tusi: building began in 457 and sisters rose at Nishapur, Isfahan, Herat, Basra, Mosul and Amid; the Imam al-Haramayn al-Juwayni then Abu Ishaq al-Shirazi taught in it, and it mothered the Sunni institutional model that the later madrasas of Baghdad followed — the caliphs prayed there and Nizam al-Mulk himself visited to inspect its library.

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Summary

The change

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Time

The Nizamiyya Madrasa of Baghdad